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|
/*
* MLSRCH.C - search routines
*
* Source Version: 2.0
* Software Release #92-0043
*
*/
#include "cpyright.h"
#include "pml.h"
#define FIND_INDEX(type, p, f, n, indx) \
{type *d, v; \
long i, j; \
d = (type *) p; \
v = (type) f; \
indx = 0L; \
if (v > d[0]) \
{indx = n - 1; \
if (v < d[indx]) \
{i = 0L; \
j = indx; \
for (indx = (i+j) >> 1L; indx > i; indx = (i+j) >> 1L) \
{if (v < d[indx]) \
j = indx; \
else \
i = indx;};};}; \
indx++;}
#define FIND_INDEX_FAST(type, p, f, n, indx, last) \
{type *d, v; \
long imn, imx; \
d = (type *) p; \
v = (type) f; \
imn = 0L; \
imx = n - 1L; \
for (indx = last; indx > imn; indx = (imn + imx) >> 1L) \
{if (v < d[indx]) \
imx = indx; \
else \
imn = indx;}; \
last = ++indx;}
#define MIN_MAX(type, p, n, pn, px, imn, imx, lim) \
{type *d, *pvn, *pvx, vn, vx, v; \
int i, in, ix; \
d = (type *) p; \
pvn = (type *) pn; \
pvx = (type *) px; \
vn = lim; \
vx = -lim; \
in = -1; \
ix = n; \
for (i = 0; i < n; i++) \
{v = *d++; \
if (v < vn) \
{vn = v; \
in = i;}; \
if (v > vx) \
{vx = v; \
ix = i;};}; \
*imn = in; \
*imx = ix; \
*pvn = vn; \
*pvx = vx;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* PM_MAXMIN - return the max and min value of the given array */
void PM_maxmin(xp, xmin, xmax, n)
REAL *xp, *xmin, *xmax;
int n;
{int i1, i2;
PM_minmax(xp, n, xmin, xmax, &i1, &i2);
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* PM_MINMAX - return the min, max and and index min, max
* - for the given array
*/
void PM_minmax(p, n, pn, px, imin, imax)
byte *p;
int n;
byte *pn, *px;
int *imin, *imax;
{int type;
type = SC_arrtype(p, -1);
switch (type)
{case SC_DOUBLE_I :
MIN_MAX(double, p, n, pn, px, imin, imax, DBL_MAX);
break;
case SC_FLOAT_I :
MIN_MAX(float, p, n, pn, px, imin, imax, FLT_MAX);
break;
case SC_INTEGER_I :
MIN_MAX(int, p, n, pn, px, imin, imax, INT_MAX);
break;
case SC_LONG_I :
MIN_MAX(long, p, n, pn, px, imin, imax, LONG_MAX);
break;
case SC_SHORT_I :
MIN_MAX(short, p, n, pn, px, imin, imax, SHRT_MAX);
break;
case SC_CHAR_I :
MIN_MAX(SIGNED char, p, n, pn, px, imin, imax, 127);
break;
default :
MIN_MAX(REAL, p, n, pn, px, imin, imax, DBL_MAX);
break;};
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* PM_MAX_VALUE - return the maximum value from the given array of doubles */
double PM_max_value(p, imin, n)
double *p;
int imin, n;
{int i;
double u, v;
v = -HUGE;
if (p != NULL)
{p += imin;
for (i = 0; i < n; i++)
{u = *p++;
v = max(v, u);};};
return(v);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* PM_INDEX_MIN - return the index of the minimum value from the
* - given array of doubles
*/
int PM_index_min(p, n)
double *p;
int n;
{int i, j;
double u, v;
j = -1;
if (p != NULL)
{v = HUGE;
for (i = 0; i < n; i++)
{u = *p++;
v = min(v, u);
if (u == v)
j = i;};};
return(j);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* PM_FIND_INDEX - return the index into array P such that
* - P[i-1] < F <= P[i]
* - return 0 if F <= P[0] and N if P[N-1] < F
*/
int PM_find_index(p, f, n)
byte *p;
double f;
int n;
{int indx, type;
type = SC_arrtype(p, -1);
switch (type)
{case SC_DOUBLE_I :
FIND_INDEX(double, p, f, n, indx);
break;
case SC_FLOAT_I :
FIND_INDEX(float, p, f, n, indx);
break;
case SC_INTEGER_I :
FIND_INDEX(int, p, f, n, indx);
break;
case SC_LONG_I :
FIND_INDEX(long, p, f, n, indx);
break;
case SC_SHORT_I :
FIND_INDEX(short, p, f, n, indx);
break;
case SC_CHAR_I :
FIND_INDEX(char, p, f, n, indx);
break;
default :
FIND_INDEX(REAL, p, f, n, indx);
break;};
return(indx);}
/*--------------------------------------------------------------------------*/
#if 0
/*--------------------------------------------------------------------------*/
/* PM_SEARCH - this routine computes an array of index locations INDX of the
* - array XV in the table Y such that
* - Y[INDX[I]-1] < X[I] <= Y[INDX[I]]
* - Given an increasing table Y[0] < Y[1] < ... < Y[NY-1],
* - interval indices 0, 1, ..., NY-1 correspond to (Y[0],Y[1]],
* - (Y[1],Y[2]], ..., (Y[NY-2],Y[NY-1]]
* -
* - It is the user's responsibility to ensure that the values
* - of X gathered are all interior to the table of Y's; that is,
* - Y[0] < X[I] <= Y[NY-1], 0 <= I < NY
* -
* - Input:
* - NX = the number of elements in the array X
* - X = an array of length NX whose locations in the
* - Y table are to be determined
* - NY = the number of elements in the table Y
* - Y = a table of increasing elements to be searched
* - OFFS = an offset that facilitates searching part of Y
* -
* - Output:
* - INDX = an array of length NX of integers locating the position
* - of each element of X in the Y table
*/
void PM_search_slow(nx, x, ny, y, offs, indx)
int nx;
REAL *x;
int ny;
REAL *y;
int offs;
int *indx;
{long ix, iy;
y += offs;
for (ix = 0; ix < nx; ix++)
{FIND_INDEX(REAL, y, x[ix], ny, iy);
indx[ix] = iy + offs;};
return;}
/*--------------------------------------------------------------------------*/
#endif
/*--------------------------------------------------------------------------*/
/* PM_SEARCH - this routine computes an array of index locations INDX of the
* - array XV in the table Y such that
* - Y[INDX[I]-1] < X[I] <= Y[INDX[I]]
* - Given an increasing table Y[0] < Y[1] < ... < Y[NY-1],
* - interval indices 0, 1, ..., NY-1 correspond to (Y[0],Y[1]],
* - (Y[1],Y[2]], ..., (Y[NY-2],Y[NY-1]]
* -
* - It is the user's responsibility to ensure that the values
* - of X gathered are all interior to the table of Y's; that is,
* - Y[0] < X[I] <= Y[NY-1], 0 <= I < NY
* -
* - Input:
* - NX = the number of elements in the array X
* - X = an array of length NX whose locations in the
* - Y table are to be determined
* - NY = the number of elements in the table Y
* - Y = a table of increasing elements to be searched
* - OFFS = an offset that facilitates searching part of Y
* -
* - Output:
* - INDX = an array of length NX of integers locating the position
* - of each element of X in the Y table
*/
void PM_search(nx, x, ny, y, offs, indx)
int nx;
REAL *x;
int ny;
REAL *y;
int offs;
int *indx;
{long ix, iy, my;
static long last = 1L;
y += offs;
my = ny - 1L;
last = min(last, my);
last = max(0L, last);
for (ix = 0; ix < nx; ix++)
{FIND_INDEX_FAST(REAL, y, x[ix], ny, iy, last);
indx[ix] = iy + offs;};
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PM_PERMUTE - given a list of dimension specifications return a permuted
* - set of them.
*/
void _PM_permute(region, strtind, noffs)
long *region;
long **strtind;
long noffs;
{long ndims, i, j, k, count, stride = 1, start, end;
ndims = region[0];
for (i = 0; i < noffs; i++)
strtind[i][0] = region[1];
for (i = 1; i < ndims; i++)
{k = start = region[2*i+1];
end = region[2*i+2];
stride = (i == 1) ? 1 :
(region[2*i] - region[2*i-1] + 1) * stride;
count = 1;
for (j = 0; j < noffs; j++)
{strtind[j][i] = k;
if ((count + 1) > stride)
{count = 1;
k = (k + 1) <= end ? (k + 1) : start;}
else
count++;};}
#if 0
printf("The permuted start indices are:\n");
for (i = 0; i < noffs; i++)
for (j = 0; j < ndims; j++)
{printf("%2ld ", strtind[i][j]);
if (j == (ndims - 1))
printf("\n");}
#endif
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PM_OFFSETS - given a list of multi-dimensional index specifications
* generate a list of 1-d offsets
*/
void _PM_offsets(dims, strtind, start, stride, noffs)
long *dims;
long **strtind;
long *start, *stride;
long noffs;
{long *min_index, ndims;
long i, j;
ndims = dims[0];
min_index = FMAKE_N(long, ndims, "offsets:min_index");
for (i = 1; i <= ndims; i++)
min_index[i-1] = dims[2*i-1];
for (i = 0; i < noffs; i++)
{start[i] = 0;
for (j = 0; j < ndims; j++)
{start[i] += (strtind[i][j] - min_index[j])
* stride[j];};}
SFREE(min_index);
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PM_HYPER_INDICES - calculate starting offsets and chunk size
* - for carving a sub-array out of an array
*/
long _PM_hyper_indices(dims, region, start, chunk)
long *dims, *region;
long **start;
long *chunk;
{long ndims, *stride, **strtind;
long i, j, noffs;
ndims = dims[0];
stride = FMAKE_N(long, ndims, "_PM_hyper_indices:stride");
/* compute stride for each dimension */
stride[0] = 1;
for (i = 1, j = 1; j < ndims; i += 2, j++)
stride[j] = (dims[i+1] - dims[i] + 1) * stride[j-1];
/* compute number of start offsets*/
noffs = 1;
for (i = ndims * 2; i > 2; i -= 2)
noffs *= region[i] - region[i-1] + 1;
/* allocate the start array */
*start = FMAKE_N(long, noffs, "_PM_hyper_indices:start");
/* allocate temporary to store permuted indices */
strtind = FMAKE_N(long *, noffs, "_PM_hyper_indices:strtind");
ndims = region[0];
for (i = 0; i < noffs; i++)
strtind[i] = FMAKE_N(long, ndims, "_PM_hyper_indices:strtind[i]");
/* permute the indices */
_PM_permute(region, strtind, noffs);
/* calculate 1-d starting offsets */
_PM_offsets(dims, strtind, *start, stride, noffs);
*chunk = region[2] - region[1] + 1;
/* free up memory */
SFREE(stride)
for (i = 0; i < noffs; i++)
SFREE(strtind[i]);
SFREE(strtind);
return(noffs);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* PM_SUB_ARRAY - given array in with dimensions dims, with bpi
* bytes per item, return a sub-array out, specified
* by reg.
*/
void PM_sub_array(in, out, dims, reg, bpi)
byte *in, *out;
long *dims, *reg;
long bpi;
{long *start, chunk, i, n;
char *pout, *pin;
n = _PM_hyper_indices(dims, reg, &start, &chunk);
pout = (char *)out;
for (i = 0; i < n; i++)
{pin = (char *)in + (start[i] * bpi);
memcpy(pout, pin, chunk*bpi);
pout = pout + chunk * bpi;}
SFREE(start);
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
|
